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The FDA's website read: "These products - sometimes also called 'nests' or 'anti-roll' products can cause suffocation (a struggle to breathe) that can lead to death.

"The two most common types of sleep positioners feature raised supports or pillows (called 'bolsters') that are attached to each side of a mat, or a wedge to raise a baby’s head.

"The positioners are intended to keep a baby in a specific position while sleeping and are intended for infants under 6 months old."

Infants should sleep on their backs on a firm, empty surface

To reduce the risk of sleep-related infant deaths, including Sudden Infant Death Syndrome, infants should sleep on their backs, positioned on a firm, empty surface, the American Academy of Pediatrics said.

The surface should be free of soft objects, toys, pillows or loose bedding.

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The Lullaby Trust in the UK also warns against using baby sleep positioners.

It says on its website: "There is no need to use any type of equipment or rolled up blankets to keep your baby in one position unless you have been advised by a health professional for a specific medical condition.

"It is much safer for your baby to be in their cot with just the sheets or blankets, and no extras which could be pulled over their face or cause an accident.

"As babies grow stronger they learn to move and roll and this is fine."